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Safety in an EM Lab. Chemicals Common chemicals Handling Disposal, waste management Cleaning and exposure Equipment Radiation Electrical safety Servicing Physical and Mechanical Hazards. Read Chapter 21 in Bozzola text!. Primary Hazard Color Code

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Presentation Transcript
slide1

Safety in an EM Lab

Chemicals

Common chemicals

Handling

Disposal, waste management

Cleaning and exposure

Equipment

Radiation

Electrical safety

Servicing

Physical and Mechanical Hazards

Read Chapter 21 in Bozzola text!

slide2

Primary Hazard Color Code

FlammablesRedToxics/HealthBlueReactives/OxidizersYellow

Contact Hazards White

GeneralGray,Green,Orange

Many labs color code bottles to aid in segregated chemical storage. The assignments given above are standard for most labs and are based upon chemical manufacturer’s color code designations. Liquids should also be stored away from solids.

slide3

Chemicals found in an EM lab

Aldehydes (glutaraldehyde, paraformaldehyde)

Carcinogenic, allergies, sensitivity

Minimize exposure to fumes

Cacodylate salts

~50% arsenic

Carcinogenic, toxic

Readily absorbed through skin (garlic taste)

Osmium tetroxide (osmic acid)

Toxic, irritant, volitile

Spills reduced to metallic osmium with corn oil or

Na Ascorbate powder, then cat litter to pick up.

slide4

Acetone and alcohols

Used as solvents, dehydrants and cleaners

Flammable- keep in flammables cabinet

Toxic

Chemicals dissolved in them can penetrate skin

Propylene oxide

Highly flammable

Carcinogen

Picric acid

Dried salts explosive

Resin Components

Carcinogenic

Allergic reactions when using antihistamines

Heavy metal salts (lead and uranium)

Toxic

Carcinogenic

slide5

MSDS Sheets

Information regarding:

Basic chemical makeup

Hazards and treatment

Handling and clean up

Transportation

Obtained from:

Original vendor

On-line

University Env. Safety

(http://www.esd.uga.edu/)

slide6

Handling

Wear:

Gloves

Lab coat

Dust mask

Closed toe shoes

Work deep in ventilation hood

Measuring:

New spatula for each chemical

Minimize dust

Have clean-up equipment available

All spills are hazardous waste

Clean after yourself !

slide7

Disposal

Spent, expired, or surplus chemicals

Minimize waste!

Use less toxic alternatives if available.

Use a minimal amount - avoid large amounts.

Keep Waste in separate containers - avoid mixing

Some can be recycled.

Easier to keep track of amounts for manifests.

Some chemicals are not compatible.

Clean up after yourself!

slide8

Clean Up!

Always clean up any spills, messes.

Make a spill kit

Mercury difficult to clean up

Can’t wipe or pick up

Use a vacuum with trap, not vacuum cleaner

(volatilizes the mercury)

Treat the Cleaning materials as hazardous waste

-Not into trash can or down sink

slide9

An inexpensive spill kit can be made with kitty litter and other items such as gloves, safety glasses, a broom, and a dust pan. Kitty litter is an excellent all purpose absorbent and should be kept in labs where high volumes of solvents are stored.

slide10

Equipment hazards

Vacuum evaporators and sputter coaters

Electrical shock

Evaporated metals easily taken up

Hot components (burns)

Implosion of bell jar

CPD

High pressures in bomb

Liquid CO2 - freeze damage

Fumes - ethanol or CO2

Explosive venting

slide11

Pumps

Oil filters to minimize inhaling

Liquid N2 and compressed gasses

Explosion of tank

SF6 gas – changes to toxic Fluorine if heated above 200 C

X-ray exposure

slide12

Physical damage

Cuts

Razor Blades

Glass knives

Inhalation

Mercury bulbs can explode if old and overheated (usually after 200-300 hours of use).

Symptoms of mercury poisoning include tremors, tunnel vision, loss of balance, slurred speech, and unpredictable emotions.